By David A. Grossman
Information Retrieval: Algorithms and Heuristics is a complete creation to the learn of data retrieval protecting either effectiveness and run-time functionality. the focal point of the presentation is on algorithms and heuristics used to discover records proper to the consumer request and to discover them quick. via a number of examples, the main common algorithms and heuristics wanted are tackled. To facilitate knowing and functions, introductions to and discussions of computational linguistics, normal language processing, chance thought and library and machine technology are supplied. whereas this article makes a speciality of algorithms and never on advertisement product consistent with se, the elemental suggestions utilized by many advertisement items are defined. thoughts that may be used to discover info on the net, in addition to in different huge info collections, are incorporated.
This quantity is a useful source for researchers, practitioners, and scholars operating in details retrieval and databases. For teachers, a suite of Powerpoint slides, together with speaker notes, can be found on-line from the authors.
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Additional info for Information Retrieval: Algorithms and Heuristics
Although changing the basis does not totally eliminate the problem, it can reduce it. The idea is to pick a basis vector for each combination of terms that exist in a document (regardless of the number of occurrences of the term). The new basis vectors can be made mutually orthogonal and can be scaled to be unit vectors. The documents and the query can be expressed in terms of the new basis vectors. Using the procedure in conjunction with other (possibly probabilistic) methods avoids independence assumptions, but in practice, it has not been shown to significantly improve effectiveness.
They are computationally expensive, but more importantly they are difficult to estimate. It is necessary to obtain sufficient training data about term co-occurence in both relevant and non-relevant documents. Typically, it is very difficult to obtain sufficient training data to estimate these parameters. 4 illustrates the need for training data with most probabilistic models. A query with two terms, qi and q2, is executed. Five documents are returned and an assessment is made that documents two and four are relevant.
Croft and Harper incorporate term frequency weights in [Croft and Harper, 1979]. Relevance is estimated by including the probability that a term will appear in a given document, rather than the simple presence or absence of a term in a document. The term frequency is used to derive an estimate of how likely it is for the term to appear in a document. This new coefficient is given below. The P(d;j) indicates the probability that term i appears in document j, and can be estimated simply as the term frequency of term i in document j.